Read the manga for this and it's a cute, fun, lighthearted piece. I thought I'd throw it in as a rec since it's an Earth Star title and thus wouldn't be too hard for JNC to acquire, and fits in with the sorts of titles that do well here (and I enjoy it enough that I'd be willing to buy it, myself).

Other notes:

Yes, the protagonist is a male reincarnated into a female, loli vampire. She(?)'s pretty crass and gives everyone unflattering nicknames, but it does help distinguish her from the usual nice-guy isekai MC.

MC does seem to be gathering something of a harem. Of girls. Definitely a lot of girl-to-girl attraction (mainly one-way towards the MC), with some bloodsucking shenanigans; whether it goes any further is beyond what I've read of the manga.

A fan translator picked it up earlier this year. At some point he decided to take contact with the author and mangaka on twitter to get permission to keep translating it(...). ... ... Well, he got it(!?)(though he's not entirely sure the publisher is aware of it so situation might be a bit gray...). Some readers were a bit angry as he removed the earlier translated chapters and started translating/retranslating the manga from the beginning, but by now he's already past the old chapters.

The manga, by author Ryuryu Shinku and artist SAKURA, is 5 volumes long and was completed in 2014. SAKURA's trademark style can best be described as very 'cute', so anyone with such inclinations should check it out, and of course the manga adaptation of the titular isekai mentioned here.

If j-novel ever has a place for licensing suggestions for manga, I think I'll cast my vote on those two.